lettre supérieure - significado y definición. Qué es lettre supérieure
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Qué (quién) es lettre supérieure - definición

Westphalen-Lettre rearrangement; Westphalen-Lettré rearrangement; Westphalen–Lettre rearrangement

École supérieure de journalisme         
WIKIMEDIA DISAMBIGUATION PAGE
Ecole Superieure de Journalisme; Ecole Supérieure de Journalisme; Ecole supérieure de journalisme; Ecole superieure de journalisme
The ESJ or École supérieure de journalisme (in English: Tertiary college of Journalism) is an institution of higher education and French Grande École dedicated to the study of Journalism. It has three sites in France:
Lettre à M. Dacier         
  • hieroglyphic]] phonetic characters that appears as an illustration in the ''Lettre à M. Dacier''
BOOK BY JEAN-FRANÇOIS CHAMPOLLION
Lettre a M. Dacier
(full title: : "Letter to M. Dacier concerning the alphabet of the phonetic hieroglyphs") is a letter sent in 1822 by the Egyptologist Jean-François Champollion to Bon-Joseph Dacier, secretary of the French Académie des Inscriptions et Belles-Lettres.
École normale supérieure         
  • Key decrees and laws on the upper part of the entrance of ''École Normale Supérieure'', 45 rue d'Ulm
TYPE OF STATE-RUN INSTITUTE OF HIGHER EDUCATION IN FRANCE
Ecole Normale Supérieure; Écoles Normales Supérieures; Écoles normales supérieures
An école normale supérieure () or ENS is a type of publicly funded higher education institution in France. A portion of the student body, admitted via a highly-selective competitive examination process, are French civil servants and are known as normaliens.

Wikipedia

Westphalen–Lettré rearrangement

The Westphalen–Lettré rearrangement is a classic organic reaction in organic chemistry describing a rearrangement reaction of cholestane-3β,5α,6β-triol diacetate with acetic anhydride and sulfuric acid. In this reaction one equivalent of water is lost, a double bond is formed at C10–C11 and importantly the methyl group at the C10 position migrates to the C5 position.

The reaction is first-order in steroid in the presence of an excess of sulfuric acid and the first reaction step in the reaction mechanism is likely the formation of a sulfate ester followed by that of a carbocation at C5 after which the actual rearrangement takes place.